It's just measuring the electrical potential between the leads, so the computer detects the difference, and displays it as such (at least that's my understanding of it). If we programmed the computer differently, we could have any lead represent any polarity.
Can somebody help me understand this? I've always thought that "leads" referred to the actual devices that we attach to a patient to produce an ECG reading: Now I'm taking a class on anatomy, and I learned that "lead" (with reference to an ECG) refers to a certain viewpoint of the heart. But after watching this video it looks like both are true: At 0:18 he says "The leads are placed on the right arm, the left arm..." which implies that the leads are the devices. However, a few seconds later at 0:25, he says "We can form 3 leads from Einthoven's Triangle". --- Does this mean that "leads" refers to both the wired devices of an ECG, and the viewpoints that they create?
Remember that the negative electrode is the “reference” and the positive electrode is the “exploring”. The positive/exploring side corresponds with the aspect of the heart we’re “looking” at (aka a Lead). Example: Lead I is a view created by the reference electrode (negative) on the right limb, and the exploring electrode (positive) on the left limb. This right to left movement is called a “vector”. Lead 1 gives a lateral (left sided) view of the heart because of the vector. Right arm (-) --vector--> Left arm (+) = Lead I Right arm (-) --vector--> Left foot (+) = Lead II Left arm (-) --vector--> Left foot (+) = Lead III
Hey, thanks for the video. I’d like to point out that for ECG purposes it’s probably best not to refer to the cables/lead wires as “leads”; since this is a bit different than electronics. Leads are the “views” (I, II, III, aVL, aVR, etc.) created by the placement of electrodes (reference and exploring), which are connected to the cables/lead wires. Otherwise we would call the ECG procedure a 4 lead or 10 lead, since we use 4 and 10 electrodes respectively.But it’s actually a 6 lead and 12 lead. Hope that helps.
Leads (views of the heart) are determined by the vector between two (sometimes 3) electrodes. A vector is the electrical potential measured in a negative to positive direction (reference electrode to exploring electrode). This is what the ECG machine is doing to produce the Leads. Lead I is a view of the lateral aspect of the heart because the right limb is being used as the negative/reference, and the left limb is being used as the positive/exploring. Lead II is a view of the inferior aspect of the heart because the right limb is being used as the negative/reference, and the left foot is being used as the positive/exploring. Lead III is a view of the inferior aspect of the heart because the left limb is being used as the negative/reference, and the left foot is being used as the positive/exploring.
i learned that there are 4 limb leads RA, LA, RL, and LL why do we not include the right leg electrode in einthoven’s triangle? is it it because it is a ground electrode?
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I am a student from India, pursuing my Bachelor's degree in Human Physiology. This video helped me a lot to understand ECG. Love the way you explain.
I can't get over how you pronounce "out"
Haha...must be my Canadian accent!
@@jjmedicine eut
Oh gosh Canadian accent!!! Rly 😁 but a fabulous video
😂
Eowt. Lol
Great video, it's a hard concept to grasp just reading from a textbook!
Awesome explanation, ur accent also makes it interesting, it would help me more to memorise this procedure. Thank you
the way you pronounce "out" is so new to me, ive never heard it pronounced like this 😅😅😅 also thank you for the video! it was super helpful
Glad you found it helpful :) Haha, yes my accent definitely shines through when I use words like "out"!
i dont understand how electrode on left arm acts in one case as negative and in the other as positive
Me too...
It's just measuring the electrical potential between the leads, so the computer detects the difference, and displays it as such (at least that's my understanding of it). If we programmed the computer differently, we could have any lead represent any polarity.
It's bipolar limb leads as such 2 charges on one arm
Can somebody help me understand this? I've always thought that "leads" referred to the actual devices that we attach to a patient to produce an ECG reading: Now I'm taking a class on anatomy, and I learned that "lead" (with reference to an ECG) refers to a certain viewpoint of the heart. But after watching this video it looks like both are true: At 0:18 he says "The leads are placed on the right arm, the left arm..." which implies that the leads are the devices. However, a few seconds later at 0:25, he says "We can form 3 leads from Einthoven's Triangle". --- Does this mean that "leads" refers to both the wired devices of an ECG, and the viewpoints that they create?
You oversimplified ECG. Thanks Doc. 😇
Glad it was helpful! :)
Why in 2nd slide you show lead 1 in place of lead 3 and all positions are change of 2 and 3 also ???
Pls axplain
They are vectors, thus he simply repositioned them with the beginning of the vector starting in the center of the body.
@@AJ4K.0 Thanks
Tysm sir u literally saved me. 😥 Physiology was about to kill me
Easy to understand thanks
Why current flowing from negetive to positive here in lead ?
Remember that the negative electrode is the “reference” and the positive electrode is the “exploring”. The positive/exploring side corresponds with the aspect of the heart we’re “looking” at (aka a Lead).
Example:
Lead I is a view created by the reference electrode (negative) on the right limb, and the exploring electrode (positive) on the left limb. This right to left movement is called a “vector”.
Lead 1 gives a lateral (left sided) view of the heart because of the vector.
Right arm (-) --vector--> Left arm (+) = Lead I
Right arm (-) --vector--> Left foot (+) = Lead II
Left arm (-) --vector--> Left foot (+) = Lead III
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Thompson Anna Lewis Brenda Gonzalez Sandra
Is our tutor Canadian?😅
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Finally I can put it all together in a visual way that makes sense. I have been so confused until now! Big thanks!!
This video just made my life way easier😭maybe CVS physiology isn't that bad.Thank you so much!
Thank uuuuuu ❤️❤️❤️
01:36 left arm not right arm.
bro why do you say out like that 🤣 great video though👍
Just watched for a minutes and I already understand leads
Hey, thanks for the video.
I’d like to point out that for ECG purposes it’s probably best not to refer to the cables/lead wires as “leads”; since this is a bit different than electronics.
Leads are the “views” (I, II, III, aVL, aVR, etc.) created by the placement of electrodes (reference and exploring), which are connected to the cables/lead wires. Otherwise we would call the ECG procedure a 4 lead or 10 lead, since we use 4 and 10 electrodes respectively.But it’s actually a 6 lead and 12 lead. Hope that helps.
You done a great job in explaining this.
How come the positive and negative keep changing?
Leads (views of the heart) are determined by the vector between two (sometimes 3) electrodes. A vector is the electrical potential measured in a negative to positive direction (reference electrode to exploring electrode). This is what the ECG machine is doing to produce the Leads.
Lead I is a view of the lateral aspect of the heart because the right limb is being used as the negative/reference, and the left limb is being used as the positive/exploring.
Lead II is a view of the inferior aspect of the heart because the right limb is being used as the negative/reference, and the left foot is being used as the positive/exploring.
Lead III is a view of the inferior aspect of the heart because the left limb is being used as the negative/reference, and the left foot is being used as the positive/exploring.
Informative.Thanks a lot💙
the third lead is from the left arm to left leg? thought it worked counterclockwise
this helped alot because i could not understand my text book what so ever
i learned that there are 4 limb leads RA, LA, RL, and LL why do we not include the right leg electrode in einthoven’s triangle? is it it because it is a ground electrode?
Correct, it is a ground used to minimize artifact.
Very useful video 👍🏼👍🏼
great video..ty
Thank you so much!!! You explained it so well!
Thnk u😘